rebase: update replaced k8s.io modules to v0.33.0

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/github.com/opencontainers/cgroups/systemd/dbus.go

@@ -0,0 +1,102 @@
+package systemd
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sync"
+
+	systemdDbus "github.com/coreos/go-systemd/v22/dbus"
+	dbus "github.com/godbus/dbus/v5"
+)
+
+var (
+	dbusC        *systemdDbus.Conn
+	dbusMu       sync.RWMutex
+	dbusInited   bool
+	dbusRootless bool
+)
+
+type dbusConnManager struct{}
+
+// newDbusConnManager initializes systemd dbus connection manager.
+func newDbusConnManager(rootless bool) *dbusConnManager {
+	dbusMu.Lock()
+	defer dbusMu.Unlock()
+	if dbusInited && rootless != dbusRootless {
+		panic("can't have both root and rootless dbus")
+	}
+	dbusInited = true
+	dbusRootless = rootless
+	return &dbusConnManager{}
+}
+
+// getConnection lazily initializes and returns systemd dbus connection.
+func (d *dbusConnManager) getConnection() (*systemdDbus.Conn, error) {
+	// In the case where dbusC != nil
+	// Use the read lock the first time to ensure
+	// that Conn can be acquired at the same time.
+	dbusMu.RLock()
+	if conn := dbusC; conn != nil {
+		dbusMu.RUnlock()
+		return conn, nil
+	}
+	dbusMu.RUnlock()
+
+	// In the case where dbusC == nil
+	// Use write lock to ensure that only one
+	// will be created
+	dbusMu.Lock()
+	defer dbusMu.Unlock()
+	if conn := dbusC; conn != nil {
+		return conn, nil
+	}
+
+	conn, err := d.newConnection()
+	if err != nil {
+		// When dbus-user-session is not installed, we can't detect whether we should try to connect to user dbus or system dbus, so d.dbusRootless is set to false.
+		// This may fail with a cryptic error "read unix @->/run/systemd/private: read: connection reset by peer: unknown."
+		// https://github.com/moby/moby/issues/42793
+		return nil, fmt.Errorf("failed to connect to dbus (hint: for rootless containers, maybe you need to install dbus-user-session package, see https://github.com/opencontainers/runc/blob/master/docs/cgroup-v2.md): %w", err)
+	}
+	dbusC = conn
+	return conn, nil
+}
+
+func (d *dbusConnManager) newConnection() (*systemdDbus.Conn, error) {
+	if dbusRootless {
+		return newUserSystemdDbus()
+	}
+	return systemdDbus.NewWithContext(context.TODO())
+}
+
+// resetConnection resets the connection to its initial state
+// (so it can be reconnected if necessary).
+func (d *dbusConnManager) resetConnection(conn *systemdDbus.Conn) {
+	dbusMu.Lock()
+	defer dbusMu.Unlock()
+	if dbusC != nil && dbusC == conn {
+		dbusC.Close()
+		dbusC = nil
+	}
+}
+
+// retryOnDisconnect calls op, and if the error it returns is about closed dbus
+// connection, the connection is re-established and the op is retried. This helps
+// with the situation when dbus is restarted and we have a stale connection.
+func (d *dbusConnManager) retryOnDisconnect(op func(*systemdDbus.Conn) error) error {
+	for {
+		conn, err := d.getConnection()
+		if err != nil {
+			return err
+		}
+		err = op(conn)
+		if err == nil {
+			return nil
+		}
+		if !errors.Is(err, dbus.ErrClosed) {
+			return err
+		}
+		d.resetConnection(conn)
+	}
+}